The only thing exclusive to the Legacy Pack is the title and unique Reman Doff pack. Everything else will be available when LoR comes out. If you buy a ton of ships and will play the Romulan faction, then it is a good deal. Otherwise, there is no point in getting it.

The liberated reman boff is also claimable on all Rom characters on your account, which is worth something compared to the C-store one.